ROCK SPRINGS CAPITAL MANAGEMENT LP
Q3 2021 Form 13-F
BALTIMORE, MARYLAND
CIK 0001595725
· CRD 168648
· SEC-registered investment adviser
$4.8B Reported Value Total
ROCK SPRINGS CAPITAL reports 6 total accounts under management (AUM). There are 6 discretionary accounts valued at $5,884,695,405, and 0 non-discretionary accounts.
Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
Private funds (Form ADV)
2 funds
· $2.4B gross asset value
Hedge Fund: $2.4B
Source: Form ADV filed 2026-03-24
Reported value
$4.8B
Quarter over quarter
-8.0%
Holdings
145
Top-10 concentration
26.3%
Key People
Form ADV owners & control persons
Gordon Margraf ("mark") Bussard
MEMBER/LIMITED PARTNER
Kris Harlan Jenner
MEMBER/LIMITED PARTNER
Nnamdi C Etoh
CHIEF FINANCIAL OFFICER
Filing Navigation
13F Metrics
Loading 13F Metrics
Q3 2021 13F record
Q3 2021 13F filing summary
| Period of report | September 30, 2021 |
|---|---|
| Filed | November 15, 2021 |
| Form | 13F-HR |
| Reported value | $4.8B |
| Positions | 145 |
| Change in reported value | -6.0% |
| New positions | 12 |
| Exited positions | 14 |
| Position turnover | 16.4% |
| Top-10 concentration | 26.3% |
13F filings by quarter
| Quarter | Positions | Value |
|---|---|---|
|
Q2 2026 13F
Filed Aug 14, 2026
|
104 | $2.0B |
|
Q1 2026 13F
Filed May 15, 2026
|
100 | $1.7B |
|
Q4 2025 13F
Filed Feb 17, 2026
|
97 | $2.0B |
|
Q3 2025 13F
Filed Nov 14, 2025
|
91 | $1.7B |
|
Q2 2025 13F
Filed Aug 14, 2025
|
92 | $1.6B |
|
Q1 2025 13F
Filed May 15, 2025
|
95 | $1.7B |
|
Q4 2024 13F
Filed Feb 14, 2025
|
105 | $2.6B |
|
Q3 2024 13F
Filed Nov 14, 2024
|
107 | $3.1B |
|
Q2 2024 13F
Filed Aug 14, 2024
|
107 | $3.3B |
|
Q1 2024 13F
Filed May 15, 2024
|
109 | $3.9B |
|
Q4 2023 13F
Filed Feb 14, 2024
|
99 | $4.1B |
|
Q3 2023 13F
Filed Nov 14, 2023
|
116 | $3.7B |
|
Q2 2023 13F
Filed Aug 14, 2023
|
119 | $4.2B |
|
Q1 2023 13F
Filed May 15, 2023
|
116 | $4.2B |
|
Q4 2022 13F
Filed Feb 14, 2023
|
116 | $4.2B |
|
Q3 2022 13F
Filed Nov 14, 2022
|
123 | $3.9B |
|
Q2 2022 13F
Filed Aug 15, 2022
|
125 | $3.4B |
|
Q1 2022 13F
Filed May 16, 2022
|
128 | $4.0B |
|
Q4 2021 13F
Filed Feb 14, 2022
|
128 | $4.3B |
|
Q3 2021 13F
Filed Nov 15, 2021
|
145 | $4.8B |
31 earlier quarters on file — choose one from the quarter menu above.
Top 20 holdings · Q3 2021
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | AGL AGILON HEALTH INC | $185.4M | 3.9% |
| 2 | HUM HUMANA INC | $133.1M | 2.8% |
| 3 | ALGN ALIGN TECHNOLOGY INC | $133.1M | 2.8% |
| 4 | PODD INSULET CORP | $124.4M | 2.62% |
| 5 | ISRG INTUITIVE SURGICAL INC | $119.3M | 2.51% |
| 6 | AGIO AGIOS PHARMACEUTICALS INC | $118.0M | 2.48% |
| 7 | ZLAB ZAI LAB LTD | $113.6M | 2.39% |
| 8 | IDXX IDEXX LABS INC | $111.9M | 2.35% |
| 9 | HCA HCA HEALTHCARE INC | $109.2M | 2.3% |
| 10 | NBIX NEUROCRINE BIOSCIENCES INC | $100.8M | 2.12% |
| 11 | ARGX ARGENX SE | $95.1M | 2.0% |
| 12 | NVAX NOVAVAX INC | $94.3M | 1.98% |
| 13 | UNH UNITEDHEALTH GROUP INC | $93.8M | 1.97% |
| 14 | IMCR IMMUNOCORE HLDGS PLC | $90.6M | 1.91% |
| 15 | BPMC BLUEPRINT MEDICINES CORP | $87.4M | 1.84% |
| 16 | HZNP HORIZON THERAPEUTICS PUB L | $76.9M | 1.62% |
| 17 | FRPT FRESHPET INC | $75.2M | 1.58% |
| 18 | NVTA INVITAE CORP | $74.1M | 1.56% |
| 19 | NVRO NEVRO CORP | $74.0M | 1.56% |
| 20 | RARE ULTRAGENYX PHARMACEUTICAL IN | $72.3M | 1.52% |
Values as reported on the Q3 2021 Form 13F. Every position is in the holdings table below.